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# Re: Guests on the MOO

- Date: Sun, 28 Apr 1996 03:31:03 PDT
- From:
- cc: moo-cows@parc.xerox.com
- Content-Type: TEXT/PLAIN; charset=US-ASCII
- In-Reply-To: <Pine.3.89.9604101708.A29633-0100000@acf2.NYU.EDU>

    Sorry if this is old, but I got emailbombed and finally got it cleared
    and have been able to go through the old email that I got a while ago
    before the bomb...

    On Wed, 10 Apr 1996, Brian E. Murfin wrote:
    > Many thanks to the people who responded on the issue of MOO security.
    > I've got another question:  Because our MOO will be used by secondary
    > school students, we need to provide a secure and safe environment.  I
    > would like to only allow guests to look, access help, and navigate
    > through the MOO.  All other commands would be disabled for visitors.  What
    > would be the easiest and most secure way of doing this?

    You could create a barren player class for guests, with only a couple of
    commands and nothing else, but don't forget that they can still issue
    commands based on verbs that lie elsewhere, such as picking up a $thing,
    or sneaking a call of another player's "spam any" verb by calling it as
    "spam this".

    The only way to really be secure about it is to create a child of
    $player, name it, say, "Blinders Layer", and give it one verb, * any any
    any.  (Be sure that it is -x, or else Bad Things will happen.)  Program
    it to return player:notify("I don't understand that.");.  This will act
    as a set of blinders (like the ones horses wear to keep them from
    wandering astray when someone's riding them), that allow you to limit
    what commands any descendant of this layer can issue.  Basically, any
    command that is NOT declared on the descendant of this will be
    intercepted by the * verb and will not be allowed to go on for further
    parsing.

    Then, @chparent $guest to the Blinders Layer, and then stick whatever
    commands on $guest that you want guests to have.  Because of the Blinders
    Layer, guests will not be able to issue ANY other commands than what you
    directly give them here.

    I hope this helps.

    Phantom

References:

- Guests on the MOO

- From: "Brian E. Murfin" <murfin@acf2.nyu.edu>

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